Publicaciones

@article{Parra2015,

title = {Spatial distribution of genetic variation of Stenocereus pruinosus (Otto) Buxb. in Mexico: analysing evidence on the origins of its domestication},

author = {Fabiola Parra and Alejandro Casas and Víctor Rocha and Antonio Gonzàlez-Rodríguez and Salvador Arias-Montes and Hernando Rodríguez-Correa and Janet Tovar},

doi = {10.1007/s10722-014-0199-x},

issn = {15735109},

year  = {2015},

date = {2015-01-01},

journal = {Genetic Resources and Crop Evolution},

volume = {62},

issue = {6},

pages = {893-912},

abstract = {We studied populations of Stenocereus pruinosus throughout Mexico, a species important for its edible fruit. The Tehuacán Valley is setting of ancient and the currently most active management of S. pruinosus; we hypothesized Tehuacán as the original area of domestication of S. pruinosus and expected to find there its highest genetic variation and original source of genes of cultivated plants. Through nuclear microsatellite loci we studied spatial distribution of genetic variation and population differentiation. We sampled wild and managed populations of the Central-western (Tehuacán, Central Valleys and Tehuantepec, Oaxaca), north-eastern (Huasteca) and south-eastern (Chiapas) regions. Differences among regions and populations were compared through homogeneity and exact test for FIS , AMOVA, Bayesian analysis, and genetic barriers. A niche analysis allowed corroborating taxonomic identity of populations. The highest genetic diversity was in Tehuantepec (HE = 0.841), decreasing towards the extremes of distribution (HE = 0.242 in Huasteca},

keywords = {Centre of origin, Columnar cacti, domestication, Genetic resources conservation, Mesoamerica, Stenocereus pruinosus},

pubstate = {published},

tppubtype = {article}

}

@article{Parra2010,

title = {Evolution under domestication: Ongoing artificial selection and divergence of wild and managed Stenocereus pruinosus (Cactaceae) populations in the Tehuacán Valley, Mexico},

author = {Fabiola Parra and Alejandro Casas and Juan Manuel Peñaloza-Ramírez and Aurea C. Cortés-Palomec and Víctor Rocha-Ramírez and Antonio González-Rodríguez},

doi = {10.1093/aob/mcq143},

issn = {10958290},

year  = {2010},

date = {2010-01-01},

journal = {Annals of Botany},

volume = {106},

issue = {3},

pages = {483-496},

abstract = {Background and AimsThe Tehuacán Valley in Mexico is a principal area of plant domestication in Mesoamerica. There, artificial selection is currently practised on nearly 120 native plant species with coexisting wild, silvicultural and cultivated populations, providing an excellent setting for studying ongoing mechanisms of evolution under domestication. One of these species is the columnar cactus Stenocereus pruinosus, in which we studied how artificial selection is operating through traditional management and whether it has determined morphological and genetic divergence between wild and managed populations.MethodsSemi-structured interviews were conducted with 83 households of three villages to investigate motives and mechanisms of artificial selection. Management effects were studied by comparing variation patterns of 14 morphological characters and population genetics (four microsatellite loci) of 264 plants from nine wild, silvicultural and cultivated populations.Key ResultsVariation in fruit characters was recognized by most people, and was the principal target of artificial selection directed to favour larger and sweeter fruits with thinner or thicker peel, fewer spines and pulp colours others than red. Artificial selection operates in agroforestry systems favouring abundance (through not felling plants and planting branches) of the preferred phenotypes, and acts more intensely in household gardens. Significant morphological divergence between wild and managed populations was observed in fruit characters and plant vigour. On average, genetic diversity in silvicultural populations (HE = 0·743) was higher than in wild (HE = 0·726) and cultivated (HE = 0·700) populations. Most of the genetic variation (90·58 ) occurred within populations. High gene flow (NmFST > 2) was identified among almost all populations studied, but was slightly limited by mountains among wild populations, and by artificial selection among wild and managed populations.ConclusionsTraditional management of S. pruinosus involves artificial selection, which, despite the high levels of gene flow, has promoted morphological divergence and moderate genetic structure between wild and managed populations, while conserving genetic diversity. © The Author 2010.},

keywords = {Cactaceae, Columnar cacti, crop evolution, domestication, Mesoamerica, Stenocereus pruinosus, traditional plant management},

pubstate = {published},

tppubtype = {article}

}